if __name__ == '__main__':
    # sm = lambda a, v: a + v
    # print(sm(1,4))
    a=20
    b=10

    # c=None
    # c=a
    # a=b
    # b=c
    # a,b=b,a
    # print(a,b)
    # li1=[10,20,30,40,50,60]
    # li2=list()
    # for i in range(1,len(li1)):
    #     li2.append(li1[-i])
    #     print(i)
    # print(li2)
    a="A"
    print(a)
